import socket,threading,time

def tcplink(sock,addr):
	print('Accept new connection form %s:%s...'%addr)
	sock.send(b'Welcome!')
	while True:
		data=sock.recv(1024)
		time.sleep(1)
		if not data or data.decode('utf-8')=='exit':
			break
		sock.send(('Hello,%s'%data.decode('utf-8')).encode('utf-8'))
	sock.close()
	print('Connection form %s:%s closed.'%addr)

s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.bind(('127.0.0.1',9999))
s.listen(5)
print('Waiting for connection...')
while True:
	sock,addr =s.accept()
	t=threading.Thread(target=tcplink,args=(sock,addr))
	t.start()
